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Robert Haas 2346df6fc3 Allow a no-wait lock acquisition to succeed in more cases. 
We don't determine the position at which a process waiting for a lock
should insert itself into the wait queue until we reach ProcSleep(),
and we may at that point discover that we must insert ourselves ahead
of everyone who wants a conflicting lock, in which case we obtain the
lock immediately. Up until now, a no-wait lock acquisition would fail
in such cases, erroneously claiming that the lock couldn't be obtained
immediately.  Fix that by trying ProcSleep even in the no-wait case.

No back-patch for now, because I'm treating this as an improvement to
the existing no-wait feature. It could instead be argued that it's a
bug fix, on the theory that there should never be any case whatsoever
where no-wait fails to obtain a lock that would have been obtained
immediately without no-wait, but I'm reluctant to interpret the
semantics of no-wait that strictly.

Robert Haas and Jingxian Li

Discussion: http://postgr.es/m/CA+TgmobCH-kMXGVpb0BB-iNMdtcNkTvcZ4JBxDJows3kYM+GDg@mail.gmail.com
2024-03-14 08:56:06 -04:00
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access Remove unused ParallelWorkerInfo.pid field 2024-03-04 12:56:02 +02:00
archive Add macro for customizing an archiving WARNING message. 2024-03-04 15:41:42 -06:00
backup Update copyright for 2024 2024-01-03 20:49:05 -05:00
bootstrap Update copyright for 2024 2024-01-03 20:49:05 -05:00
catalog Introduce "builtin" collation provider. 2024-03-13 23:33:44 -07:00
commands Reintroduce MAINTAIN privilege and pg_maintain predefined role. 2024-03-13 14:49:26 -05:00
common Add the system identifier to backup manifests. 2024-03-13 15:12:33 -04:00
datatype Update copyright for 2024 2024-01-03 20:49:05 -05:00
executor Fix confusion about the return rowtype of SQL-language procedures. 2024-03-12 18:16:25 -04:00
fe_utils Update copyright for 2024 2024-01-03 20:49:05 -05:00
foreign Update copyright for 2024 2024-01-03 20:49:05 -05:00
jit jit: Require at least LLVM 10. 2024-01-25 15:42:34 +13:00
lib Fix incorrect format specifier for int64 2024-03-07 14:26:52 +07:00
libpq Move initialization of the Port struct to the child process 2024-03-12 13:42:38 +02:00
mb Unicode case mapping tables and functions. 2024-03-07 11:15:06 -08:00
nodes Reintroduce MAINTAIN privilege and pg_maintain predefined role. 2024-03-13 14:49:26 -05:00
optimizer Fix incorrect filename reference in comment 2024-03-13 09:34:11 +13:00
parser Add a const decoration 2024-01-25 13:34:49 +01:00
partitioning Update copyright for 2024 2024-01-03 20:49:05 -05:00
pch Update copyright for 2024 2024-01-03 20:49:05 -05:00
port Fix link error for test_radixtree module on Windows 2024-03-08 10:57:40 +07:00
portability Update copyright for 2024 2024-01-03 20:49:05 -05:00
postmaster Use MyBackendType in more places to check what process this is 2024-03-04 10:25:12 +02:00
regex Update copyright for 2024 2024-01-03 20:49:05 -05:00
replication Introduce a new GUC 'standby_slot_names'. 2024-03-08 08:10:45 +05:30
rewrite Support MERGE into updatable views. 2024-02-29 15:56:59 +00:00
snowball Update copyright for 2024 2024-01-03 20:49:05 -05:00
statistics Update copyright for 2024 2024-01-03 20:49:05 -05:00
storage Allow a no-wait lock acquisition to succeed in more cases. 2024-03-14 08:56:06 -04:00
tcop Update copyright for 2024 2024-01-03 20:49:05 -05:00
tsearch Update copyright for 2024 2024-01-03 20:49:05 -05:00
utils Introduce "builtin" collation provider. 2024-03-13 23:33:44 -07:00
.gitignore Refactor dlopen() support 2018-09-06 11:33:04 +02:00
c.h Remove AIX support 2024-02-28 15:17:23 +04:00
fmgr.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
funcapi.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
getopt_long.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
Makefile Put genbki.pl output into src/include/catalog/ directly 2024-03-14 07:11:21 +01:00
meson.build Update copyright for 2024 2024-01-03 20:49:05 -05:00
miscadmin.h Use MyBackendType in more places to check what process this is 2024-03-04 10:25:12 +02:00
pg_config.h.in Add --copy-file-range option to pg_upgrade. 2024-03-06 12:01:01 +13:00
pg_config_ext.h.in Autoconfiscate selection of 64-bit int type for 64-bit large object API. 2012-10-07 21:52:43 -04:00
pg_config_ext.h.meson meson: Add initial version of meson based build system 2022-09-21 22:37:17 -07:00
pg_config_manual.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
pg_getopt.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
pg_trace.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
pgstat.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
pgtar.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
pgtime.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
port.h Replace calls to pg_qsort() with the qsort() macro. 2024-02-16 11:37:50 -06:00
postgres.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
postgres_ext.h Move RelFileNumber declarations to common/relpath.h. 2022-09-27 12:01:57 -04:00
postgres_fe.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
varatt.h Update copyright for 2024 2024-01-03 20:49:05 -05:00
windowapi.h Update copyright for 2024 2024-01-03 20:49:05 -05:00